Abstract
Nd-doped phosphate glass is the dominant amplifier material used in solid
state high average power laser systems. Surface imperfection and subsurface damage
(SSD) of the glass, resulting from the optical fabrication process, limit the
increment of laser system energy output. Thus, it is important to enhance the
surface damage threshold of Nd-doped phosphate glass surface. The in°uence of
abrasive size, polishing powder, grinding mode, and chemical treatment on the
laser-induced damage threshold (LIDT) of Nd-doped phosphate glass surface is
investigated. Results show that the LIDT is affected little by different polishing
powders and grinding modes. The LIDT correlates with the abrasive size, which
produced different depths of SSD. A suitable acid etching treatment can remove the
imperfection and the SSD for improving the LIDT of Nd-doped phosphate glass surface.
The combination of several effective techniques and methods, which are low-cost and
practical, should be useful to enhance the LIDT of Nd-doped phosphate glass surface.
© 2012 Chinese Optics Letters
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